It's funny because a while back he said
Bitcoin is exciting because it shows how cheap it can be,". "Bitcoin is better than currency in that you don't have to be physically in the same place and, of course, for large transactions, currency can get pretty inconvenient."
Do you see the irony, or hypocrisy, as you want... Yet fiats are by far more used for any illegal activity, and I doubt people are buying fentanyl with crypto currencies. I don"t even know where he got this...
That change of mind probably has to do with governments asking that he stopped backing bitcoin, after all he is probably one of the most known people when it comes to computers now that Steve Jobs died, since he is so influential the powers behind the curtain are asking of him to spread bad comments about bitcoin so this slows down adoption.